Flow Capacity Question?

[arbitrader]

I know this is a basic hydraulics question, but here goes:

I am limited to 100 psig at the discharge of a centrifugal pump.

Product is gasoline with SG of 0.72.
Static head is 25'.

I want to determine max flow rate for a given size pipe and have calculated all of my equivalent lengths of pipe, fittings, valves.

I know that my static head of 25' of gasoline uses up 7.8 psig of my 100 psig allowable. Question is; when I calculate my friction head (using Cameron Hydraulic Data)do I convert this head value to psig based upon SG of water or gasoline?

 

[quark]

To convert head term to pressure term, you should use specific gravity of the particular liquid that is being pumped.